每年出版 8 期
ISSN 打印: 1065-5131
ISSN 在线: 1563-5074
IF:
2.3
5-Year IF:
1.8
Immediacy Index:
0.2
Eigenfactor:
0.00037
JCI:
0.6
SJR:
0.433
SNIP:
0.593
CiteScore™::
4.3
H-Index:
35
Indexed in
EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER, FRICTION FACTOR, AND OPTIMAL FIN GEOMETRIES FOR THE INTERNALLY MICROFIN TUBES IN THE TRANSITION AND TURBULENT REGIONS
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摘要
For internally microfin tubes, most of the heat transfer and friction factor studies were focused on the turbulent region. However, there is a lack of information about the heat transfer and friction factor behavior of microfin tubes in the entire flow regime that covers laminar, transition, and turbulent regions. Furthermore, the effects of fin geometries and inlet configurations on microfin tube heat transfer and friction factor were seldom discussed. Therefore, an experimental study for friction factor and heat transfer on three microfin tubes with different inlet configurations (squared-edge and re-entrant) was conducted and the measured data were compared with the data of a plain tube. From the friction factor and heat transfer results, the transition from laminar to turbulent was clearly established and shown to be inlet- and spiral-angle dependent. For all the microfin tubes with two inlet types, it was observed that the efficiency index was larger than 1 when the Reynolds number was larger than 5000. The current microfin tubes data were also compared with the existing heat transfer and friction factor correlations in the turbulent region. Finally, the genetic algorithms and the algorithms of changes were applied to the existing turbulent correlations to find the optimal fin geometry. The efficiency index computed by both numerical methods outperformed the index computed by the fin geometries used in the past studies. This proved that both algorithms were capable of finding the optimal fin geometry of the microfin tubes
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Tam Hou Kuan, Tam Lap Mou, Ghajar Afshin J., Chen I Ping, Experimental study of the ultrasonic effect on heat transfer inside a horizontal mini-tube in the laminar region, Applied Thermal Engineering, 114, 2017. Crossref
-
Wang Yong-Hui, Zhang Ji-Li, Ma Zhi-Xian, Experimental determination of single-phase pressure drop and heat transfer in a horizontal internal helically-finned tube, International Journal of Heat and Mass Transfer, 104, 2017. Crossref
-
Everts M., Meyer J.P., Relationship between pressure drop and heat transfer of developing and fully developed flow in smooth horizontal circular tubes in the laminar, transitional, quasi-turbulent and turbulent flow regimes, International Journal of Heat and Mass Transfer, 117, 2018. Crossref
-
Meyer J.P., Everts M., Single-phase mixed convection of developing and fully developed flow in smooth horizontal circular tubes in the laminar and transitional flow regimes, International Journal of Heat and Mass Transfer, 117, 2018. Crossref
-
Everts M., Meyer J.P., Heat transfer of developing and fully developed flow in smooth horizontal tubes in the transitional flow regime, International Journal of Heat and Mass Transfer, 117, 2018. Crossref
-
Everts M., Meyer J.P., Flow regime maps for smooth horizontal tubes at a constant heat flux, International Journal of Heat and Mass Transfer, 117, 2018. Crossref
-
Wei Wei, Sun Fengzhong, Shi Yuetao, Ma Lei, Experimental research of fouling layer and prediction of acid condensation outside heat exchanger used in coal-fired boiler, Applied Thermal Engineering, 131, 2018. Crossref
-
Abraham J. P., Sparrow E. M., Gorman J. M., Zhao Yu, Minkowycz W. J., Application of an Intermittency Model for Laminar, Transitional, and Turbulent Internal Flows, Journal of Fluids Engineering, 141, 7, 2019. Crossref
-
Meyer J.P., Everts M., Coetzee N., Grote K., Steyn M., Heat transfer coefficients of laminar, transitional, quasi-turbulent and turbulent flow in circular tubes, International Communications in Heat and Mass Transfer, 105, 2019. Crossref
-
Wu Zan, Sundén Bengt, Frictional Pressure Drop Correlations for Single-Phase Flow, Condensation, and Evaporation in Microfin Tubes, Journal of Heat Transfer, 138, 2, 2016. Crossref
-
Meyer Josua P., Everts Marilize, , 51, 2019. Crossref
-
Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Advanced Internal Fin Geometries and Finned Annuli, in Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli, 2020. Crossref
-
Everts Marilize, Meyer Josua P., Laminar hydrodynamic and thermal entrance lengths for simultaneously hydrodynamically and thermally developing forced and mixed convective flows in horizontal tubes, Experimental Thermal and Fluid Science, 118, 2020. Crossref
-
Ma Zhixian, Zhao Nan, Zhou Anping, Zhang Jili, Single-Phase Heat Transfer and Pressure Drop of Developing Flow at a Constant Heating Flux Inside Horizontal Helical Finned Tubes, in Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019), 2020. Crossref
-
Everts Marilize, Robbertse Pascal, Spitholt Blayne, The effects of surface roughness on fully developed laminar and transitional flow friction factors and heat transfer coefficients in horizontal circular tubes, International Journal of Heat and Mass Transfer, 189, 2022. Crossref
-
Ghajar Afshin J., Heat Transfer Results in Micro-fin Tubes, in Single- and Two-Phase Flow Pressure Drop and Heat Transfer in Tubes, 2022. Crossref
-
Ghajar Afshin J., Friction Factor Results for Micro-fin Tubes, in Single- and Two-Phase Flow Pressure Drop and Heat Transfer in Tubes, 2022. Crossref
-
Ghajar Afshin J., Proposed Correlations for Laminar, Transition, and Turbulent Friction Factors in Micro-fin Tubes with Different Inlet Configurations, in Single- and Two-Phase Flow Pressure Drop and Heat Transfer in Tubes, 2022. Crossref